Perf suggestion for crlf handling

I haven't measured this but....

As long a the crlf filtering is loading the entire blob/file into a buffer, there are some opportunities here for perf gains.

In git_buf_text_is_binary() we examine the entire file. While there we could count the number of CRLFs, and plain LFs and return those sums. We should be able to use those sums in git_buf_text_gather_stats(). Or combine those 2 routines into 1. Then in git_buf_text_lf_to_crlf() add this delta "(count_crlf - count_lf)" as padding to the amount of reserved space in the destination buffer so that the memcpy loop doesn't need to realloc as the file is being converted.

まず git_buf_text_is_binary()、git_buf_text_gather_stats()、git_buf_text_lf_to_crlf() を読んで、現在のバッファと行末の処理を理解してください。提案されている結合カウントとパディングを評価する前に、既存の動作を測定してください。変換によって不要な再割り当てを避けつつ、結果のテキストを変更しなければ完了です。